updated kdoc so it highlights parameters with default values and varargs

libraries/kdoc/src/main/kotlin/org/jetbrains/kotlin/doc/model/KotlinModel.kt

@@ -323,7 +323,7 @@ class KModel(var context: BindingContext, val config: KDocConfig) {
         val returnType = getType(descriptor.getReturnType())
         if (returnType != null) {
             val name = descriptor.getName()
-            val answer = KParameter(name, returnType)
+            val answer = KParameter(descriptor, name, returnType)
             configureComments(answer, descriptor)
             return answer
         }
@@ -833,10 +833,21 @@ class KProperty(val owner: KClassOrPackage, val descriptor: PropertyDescriptor,
     fun toString() = "property $name"
 }
 
-class KParameter(val name: String,
+class KParameter(val descriptor: ValueParameterDescriptor, val name: String,
         var aType: KType): KAnnotated(aType.model, aType.declarationDescriptor)  {
 
     fun toString() = "$name: ${aType.name}"
+
+    fun isVarArg(): Boolean = descriptor.getVarargElementType() != null
+
+    fun hasDefaultValue(): Boolean = descriptor.hasDefaultValue()
+
+    fun varArgType(): KType? {
+        val varType = descriptor.getVarargElementType()
+        return if (varType != null) {
+            aType.model.getType(varType)
+        } else null
+    }
 }
 
 class KTypeParameter(val name: String,

libraries/kdoc/src/main/kotlin/org/jetbrains/kotlin/doc/templates/ClassExtensionsTemplate.kt

@@ -43,6 +43,8 @@ from package ${link(pkg)}
 """)
     }
 
-    override fun href(f: KFunction): String = if (f.extensionClass == klass) "#${f.link}" else super.href(f)
+    override fun href(f: KFunction): String {
+        return if (f.extensionClass != null) "#${f.link}" else super.href(f)
+    }
 
 }

libraries/kdoc/src/main/kotlin/org/jetbrains/kotlin/doc/templates/PackageTemplateSupport.kt

@@ -219,10 +219,28 @@ abstract class PackageTemplateSupport(open val pkg: KPackage) : KDocTemplate() {
     fun printParameters(method: KFunction): Unit {
         print("(")
         var first = true
+        var defaultValue = false
         for (p in method.parameters) {
+            if (!p.hasDefaultValue() && defaultValue) {
+                print("]")
+                defaultValue = false
+            }
             if (first) first = false else print(", ")
+            if (p.hasDefaultValue() && !defaultValue) {
+                print(" [")
+                defaultValue = true
+            }
+            val pType = if (p.isVarArg()) {
+                print("vararg ")
+                p.varArgType().sure()
+            } else {
+                p.aType
+            }
             print("${p.name}: ")
-            print(link(p.aType))
+            print(link(pType))
+        }
+        if (defaultValue) {
+            print("]")
         }
         print(")")
     }